66225173 has 4 divisors (see below), whose sum is σ = 75685920. Its totient is φ = 56764428.

The previous prime is 66225169. The next prime is 66225191. The reversal of 66225173 is 37152266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 66225173 - 2² = 66225169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66225163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4730363 + ... + 4730376.

It is an arithmetic number, because the mean of its divisors is an integer number (18921480).

Almost surely, 2^66225173 is an apocalyptic number.

It is an amenable number.

66225173 is a deficient number, since it is larger than the sum of its proper divisors (9460747).

66225173 is an equidigital number, since it uses as much as digits as its factorization.

66225173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9460746.

The product of its digits is 15120, while the sum is 32.

The square root of 66225173 is about 8137.8850446538. The cubic root of 66225173 is about 404.5830653122.

The spelling of 66225173 in words is "sixty-six million, two hundred twenty-five thousand, one hundred seventy-three".